Finding the Fourth Proportional to 39,871.31, 55,023.82 and 21,967.68

Step by Step Solution

1. Step 1: Write the proportion equation
   39,871.31 : 55,023.82 = 21,967.68 : x
2. Step 2: Convert to fraction form
   39,871.31/55,023.82 = 21,967.68/x
3. Step 3: Cross multiply
   39,871.31x = 55,023.82 × 21,967.68
4. Step 4: Simplify right side
   39,871.31x = 1,208,745,395.02
5. Step 5: Solve for x
   x = 1,208,745,395.02/39,871.31
6. Step 6: Final answer
   x = 30,316.17